Translation:Discovery and invention are not the same thing.
It's ironic that you have this as a statement when you also have ""Η εφεύρεση του ηλεκτρισμού ήταν σημαντική."!
Yes, sometimes the sentences are not factually up to speed as we are aiming for linguistic accuracy and there are lapses. We correct them when we can and this one "Η εφεύρεση..."is listed for correction i the new tree.